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This paper proposes the reconfigurable RX analog baseband transformer that supports multi-standard applications. The proposed ABB can transform its structure between a delta-sigma modulated ADC for narrow band and a baseband LPF for wide band with a simple switch configuration without extra cost. Thus, the ABB obtains efficiency in both size and power aspects. It occupies only 0.11mm2 of active area...
Having the advantage of being very simple in concept, easy to implement and computationally efficient, Particle Swarm Optimization (PSO) algorithm is a powerful evolutionary computation tool for electronic circuit design. In this work, usage of PSO algorithm in analog active filter design is investigated. For this purpose, the performance of the algorithm has been tested on the design of a 2nd order...
The paper presents the novel control system for a shunt active power filter (APF) connected to an electrical grid via LCL circuit. Such a circuit constitutes 3rd order low pass filter and almost completely attenuates current ripples from PWM, which are the major drawback of APF connected via inductors. Such a solution requires control that overcomes LCL resonance problem and, at the same time, maximizes...
A new tuning technique is proposed to enable highly linear active Gm-C filter design. The transconductance cells of the Gm-C filter are tuned using switched resistors (SRs) which change the equivalent reference resistance of each cell. In the master tuning circuit, a feedback loop containing a continuous-time comparator is used to force the equivalent resistance of an SR branch to be equal to that...
This paper deals with the design of a novel tunable dual response active filter aiming to allow the coexistence in a single terminal of the respective standards, DVB-H for digital TV reception, WIMAX for internet connectivity and GSM for cellular telephony. The filter concept is based on the combination of an active low-pass filter and a semi-lumped tunable active notch filter. Both of two filters...
A 6th order Chebyshev type I low pass filter applied in zero-IF wireless receivers, implemented in 0.18 ??m CMOS technology is introduced, this filter is realized with leapfrog structure, has an attenuation of 30 dB at 5.25 MHz, less than 1 dB in-band ripple, 25 nV/sqrt(Hz) input referred noise at 5 kHz, and draws 2.6 mA from 1.8 V supply. By employing frequency calibration circuit, the cut-off frequency...
This paper introduces a novel voltage-mode multifunction biquad filter with single input and four outputs. The circuit is constructed with single fully differential current conveyor, two grounded capacitors and three resistors. The circuit offers the following advantageous features: (i) the employment of only one current conveyor, (ii) the employment of only two grounded capacitors, (iii) the employment...
In this paper we present different types of active filters designed using analog current-starved pseudo floating-gate (CSPFG) inverters. We show how we can design all types of filters (low pass, high pass, band pass and band reject) using only a combination of capacitors and CSPFG inverters, resulting in area-saving circuits suited for VLSI and ULSI circuit design. The corner frequencies of these...
This paper presents a sixth order Butterworth switched capacitor (SC) low pass filter with radiation-hardened-by-design (RHBD) for cryogenic applications. Implemented in a 0.5 mum SiGe BiCMOS technology, this cryogenic SC filter is capable of operating over an ultra-wide temperature (UWT) range from -180degC to 120degC and under high-energy particle radiation environment on the lunar surface. This...
This paper describes a current mode integrator and filter. The circuit can operate at high cutoff frequency and has low input impedance. The design of current mode integrator is based on a low input impedance current mirror with grounded capacitors. The integrator provides a building block for using in active filter circuits based on the doubly terminated LC ladder filter prototype. A 5th order low...
This paper introduces a current-mode universal biquadratic filter using current controlled current differencing buffered amplifiers (CCCDBAs). The filter circuit is constructed with two CCCDBAs, two current controlled current differencing amplifiers (CCCDAs) and two grounded capacitors. The circuit can realize low-pass, band-pass, high-pass, band-stop and all-pass transfer functions by choosing appropriate...
This article presents a current-mode universal biquadratic filter (low-pass, high-pass, band-pass functions), based on multiple-output current controlled current conveyor transconductance amplifiers (MO-CCCCTAs). The features of the circuit are that: the quality factor and pole frequency can be tuned orthogonally via the input bias currents: the circuit description is very simple, consisting of merely...
A new voltage-mode three inputs and one output universal biquadratic filter with high-input impedance employing six simple operational transconductance amplifiers (OTAs) and two grounded capacitors is presented. The proposed circuit offers the following features: realization of all the standard filter functions, that is, highpass, bandpass, lowpass, bandstop, and allpass filters; electronically tunable...
This paper presents a CMOS low-pass continuous-time current mode filter for low voltage applications. Firstly, the state-space description and the used synthesis technique of the filter are presented. Then the current-mode integrator is presented and analyzed. Finally, the fifth order low-pass filter is described and analyzed. The filter achieves a 10 MHz cutoff frequency. The dynamic range is about...
A universal current-mode active filter based on 2 types of integrator, lossy and lossless integrators, is presented. The biquadratic transfer function is obtained by the two integrators loop. The proposed circuit employs only 2 multiple output OTAs (MO-OTA) and 3 capacitors. The parameter Qp can be wide-range tuned independent from the omegap either changing of capacitor and transconductance gains...
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